Yeah, unfortunately the ION Drum Rocker isn't made by Harmonix/Mad Catz, so immediately accessibility may not be high on their list. However, ION would only need to make a new drum brain, so it should be relatively simple for them, right? Riiigght???

Due to licensing restrictions, Rock Band 3’s on-disc music will also not be available in Rock Band 4, though Harmonix told IGN that it’s possible that a deal could be reached in the future for this to happen

Yeah, my gf and I split an Xbone for Halo/Dragon Age, so I'm lucky there. Honestly, I wouldn't buy a next gen system just for RB4 either. At least, not until all the things I need are confirmed & implemented.

They say that DLC is transferable to next-gen systems, but there's no time table on how long that will even take yet.

I'm cautiously optimistic. They say the DLC will be available, but then the asterisk says it's not guaranteed.

The timing of release of “legacy” DLC on next-generation consoles is to be determined and may be subject to change. “Legacy” DLC will be downloadable and playable in Rock Band 4 only after the DLC is released on next-generation consoles.

On top of that, I have the ION Drum Rocker, so if that's not going to work with the game, then I'll be really annoyed.

My mother had a Relay for Life team at a high school up north a bit. Somehow she convinced the organizers to have a Rock Band setup. They provided the projector and I brought my ion drum rocker, Xbox, mic stands and 1000+ song library to rock out with a few friends and tons of strangers.

It was a fun night impressing all the fly hunnies with my plastic instrument skills.

We then gathered everything up and left at 2 am because we didn't have a tent. (Nice planning mom). The organizers were telling us how we weren't allowed to go outside. Just said peace and carried boxes of stuff past them.